multiple issues:

Authenticated page requests may return cached anonymous pages
https://www.drupal.org/node/2308947 [^]

Module doesn't recognise external username change
https://www.drupal.org/node/2310137 [^]

Fix trailing whitespace in code
https://www.drupal.org/node/2310149 [^]

Module help
https://www.drupal.org/node/2310135 [^]

Internal functions should not be named as hooks
https://www.drupal.org/node/2310133 [^]

Configuration variables incorrect
https://www.drupal.org/node/2310129 [^]

Check login as early as possible
https://www.drupal.org/node/2310127 [^]

Customizable login and logout links
https://www.drupal.org/node/2310119 [^]

Compare external username against authname in authmap
https://www.drupal.org/node/2310121 [^]